add a new session object

The objective of the object is to facilita the storage of session related data
The parameter to give (sessiondb) is a dictionary like (tipically a record)

fapws/contrib/sessions.py

@@ -0,0 +1,55 @@
+#    Copyright (C) 2009 William.os4y@gmail.com
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, version 2 of the License.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+import datetime, time
+try:
+    import cPickle as pickle
+except:
+    import pickle
+import os
+import binascii
+
+class Session:
+    def __init__(self,sessiondb,datetime_fmt="%Y-%m-%d %H:%M:%S"):
+        self.sessiondb=sessiondb # must have a get method abd return dictionary like object with sessionid, strdata and expiration_date
+        self.datetime_fmt=datetime_fmt
+    def getdata(self):
+        exp=self.sessiondb['expiration_date']
+        if type(exp)==type(datetime.datetime(2011,1,1)):
+            expdate=exp
+        elif type(exp)==type("string") or type(exp)==type(u"string"):
+            expdate=datetime.datetime.fromtimestamp(time.mktime(time.strptime(exp, self.datetime_fmt))) 
+        else:
+            raise ValueError, "expiration_Date must be a datetime object or a string (%s)" % self.datetime_fmt
+        if expdate>datetime.datetime.now():
+            #expired
+            return None
+        else:
+            strdata=str(self.sessiondb['strdata'])
+            data=pickle.loads(strdata)
+            return data
+    def setdata(self, data):
+        strdata=pickle.dumps(data)
+        if not self.sessiondb['sessionid']:
+            self.newid()
+        self.sessiondb['strdata']=strdata
+        self.sessiondb['expiration_date']=self._getdate()
+    def newid(self):
+        sessid=binascii.hexlify(os.urandom(12))
+        self.sessiondb['sessionid']=sessid
+        self.sessiondb['expiration_date']=self._getdate()
+    def _getdate(self):
+        return datetime.datetime.now().strftime(self.datetime_fmt)
+
+